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Similarly, how often should you water trichocereus?
Trichocereus pachanoi needs a regular watering during the growing season and occasionally (approximately each 2 months) some extra liquid fertilizer. Older plants can tolerate full sun (even outside the greenhouse) but be carefull with younger plants.
Moreover, can I cut the top off my cactus and replant it?
Cactus plants can grow new plants from pieces cut from the main cacti. You can remove one of these smaller plants to grow into a new cactus. Removing the cutting and transplanting it properly prevents damage to the original plant and helps ensure the new cactus grows well.
They are difficult to get rid of but try a mix of 50/50 water and rubbing alcohol and a few drops of dish washing soap in a hand held spray bottle. Spray the affected are well and use a soft brush or sponge to gently rub down the area. This should remove the existing scale.